From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Paul Eggert Newsgroups: gmane.emacs.devel Subject: Re: Using the GNU GMP Library for Bignums in Emacs Date: Thu, 3 May 2018 14:48:56 -0700 Organization: UCLA Computer Science Department Message-ID: <1f127a86-83b2-46ab-3401-7aebee89ed48@cs.ucla.edu> References: <29f933ac-a6bf-8742-66a7-0a9d6d3e5a88@disroot.org> <42cbc5ab-2f02-4aa5-4b19-7b2357f91692@cs.ucla.edu> <1f58acbf-a7d8-bf4e-3d0e-a285515a22e6@cs.ucla.edu> <2549728d-8e40-b46a-009e-07cef0c24208@cs.ucla.edu> <63fdd138-77d3-89b9-aa69-490300f588a9@cs.ucla.edu> <838t90pr2l.fsf@gnu.org> <83sh78o6af.fsf@gnu.org> NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit X-Trace: blaine.gmane.org 1525384437 24516 195.159.176.226 (3 May 2018 21:53:57 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Thu, 3 May 2018 21:53:57 +0000 (UTC) User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0 Cc: rms@gnu.org, emacs-devel@gnu.org To: Helmut Eller , Eli Zaretskii Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Thu May 03 23:53:53 2018 Return-path: Envelope-to: ged-emacs-devel@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1fEMAi-0006Gi-UQ for ged-emacs-devel@m.gmane.org; Thu, 03 May 2018 23:53:53 +0200 Original-Received: from localhost ([::1]:59287 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fEMCp-0000jC-PY for ged-emacs-devel@m.gmane.org; Thu, 03 May 2018 17:56:03 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:34398) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fEM64-0004Gk-Gj for emacs-devel@gnu.org; Thu, 03 May 2018 17:49:05 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fEM63-0008Uc-Pg for emacs-devel@gnu.org; Thu, 03 May 2018 17:49:04 -0400 Original-Received: from zimbra.cs.ucla.edu ([131.179.128.68]:36814) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1fEM5z-0008MS-Lf; Thu, 03 May 2018 17:48:59 -0400 Original-Received: from localhost (localhost [127.0.0.1]) by zimbra.cs.ucla.edu (Postfix) with ESMTP id 7E8CA1601D4; Thu, 3 May 2018 14:48:57 -0700 (PDT) Original-Received: from zimbra.cs.ucla.edu ([127.0.0.1]) by localhost (zimbra.cs.ucla.edu [127.0.0.1]) (amavisd-new, port 10032) with ESMTP id 1_y17g6PZy1J; Thu, 3 May 2018 14:48:56 -0700 (PDT) Original-Received: from localhost (localhost [127.0.0.1]) by zimbra.cs.ucla.edu (Postfix) with ESMTP id CB0D01601E6; Thu, 3 May 2018 14:48:56 -0700 (PDT) X-Virus-Scanned: amavisd-new at zimbra.cs.ucla.edu Original-Received: from zimbra.cs.ucla.edu ([127.0.0.1]) by localhost (zimbra.cs.ucla.edu [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id TPRd00QrhuVC; Thu, 3 May 2018 14:48:56 -0700 (PDT) Original-Received: from Penguin.CS.UCLA.EDU (Penguin.CS.UCLA.EDU [131.179.64.200]) by zimbra.cs.ucla.edu (Postfix) with ESMTPSA id AF8F11601D4; Thu, 3 May 2018 14:48:56 -0700 (PDT) In-Reply-To: Content-Language: en-US X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [fuzzy] X-Received-From: 131.179.128.68 X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.org gmane.emacs.devel:225056 Archived-At: On 05/03/2018 01:30 PM, Helmut Eller wrote: > Still convinced that "fffffffffffffefe cannot be a fixnum"?. No, Eli's right. Emacs has never interpreted fffffffffffffefe as a fixnum on any practical platform, as far as I know. In Elisp code on practical platforms, #xfffffffffffffefe is a fixnum neither in master (where it is an overflow error) nor in Emacs 25 (where it is typically converted silently to 1.8446744073709552e+19, with some loss of information). If Emacs gets bignums, #xfffffffffffffefe will be lossless and will have the same meaning as 18446744073709551358, which is the standard interpretation of this hexadecimal number in C and in most other languages.